package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetMealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

/**
 * @author 梦龙
 * @date 2023/11/28 18:55
 */

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetMealDishMapper setMealDishMapper;

    /**
     * @description:新增菜品和对应口味 创建菜品以及口味，可能涉及两张表的操作。
     * 所以我们要在这里加上事务注解，保证我们方法的原子性，要么全成功，要么全失败
     * @return: void
     * @time: 2023/11/28 18:56
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {

        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //向菜品表插入1条数据，一次只能添加一个菜品
        dishMapper.insert(dish);

        //获取insert语句生成的主键值
        Long id = dish.getId();

        //向口味表插入n条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(id);
            });
            dishFlavorMapper.insert(flavors);
        }
    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断当前菜品是否能够被删除---是否存在起售中的菜品
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        //判断当前菜品是否能够被删除---是否被套餐关联
        List<Long> setMealIds = setMealDishMapper.getSetMealIdByDishIds(ids);
        if (setMealIds != null && setMealIds.size() > 0) {
            //当前菜品被套餐关联，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        //删除菜品表中菜品数据
//        for (Long id : ids) {
//            setMealDishMapper.deleteById(id);
//            //删除菜品关联的口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }
        //优化
        //根据菜品id集合批量删除菜品数据
        dishMapper.deleteByIds(ids);
        //根据菜品id集合批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);
    }

    @Override
    @Transactional
    public DishVO getByIdWithFlavor(Long id) {
        DishVO dishVO = new DishVO();

        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getById(id);

        //将查询到的数据封装到VO
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * @description:根据id修改菜品信息以及口味信息
     * @return: void
     * @author: 梦龙
     * @time: 2023/11/29 16:17
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);

        //修改菜品表基本信息
        dishMapper.update(dish);
        Long id = dishDTO.getId();
        //删掉菜品id对应的所有口味
        dishFlavorMapper.deleteByDishId(id);

        //增加新的口味
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(id);
            });
            dishFlavorMapper.insert(flavors);
        }
    }

    /**
     * @description:根据分类id查询菜品信息
     * @return: com.sky.vo.DishVO
     * @author: 梦龙
     * @time: 2023/11/30 13:54
     */
    @Override
    public List<DishVO> list(Long categoryId) {
        return dishMapper.list(categoryId);
    }

    @Override
    public void startOrStopDish(Integer status, Long id) {
        Dish dish = new Dish().builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
//        List<DishVO> dishList = dishMapper.list(dish.getCategoryId());

        List<Dish> dishList = dishMapper.listByDish(dish);


        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getById(d.getId());
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);
            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
